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Diffstat (limited to 'src/docs/as_ptr_cast_mut.txt')
| -rw-r--r-- | src/docs/as_ptr_cast_mut.txt | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/src/docs/as_ptr_cast_mut.txt b/src/docs/as_ptr_cast_mut.txt deleted file mode 100644 index 228dde996bb..00000000000 --- a/src/docs/as_ptr_cast_mut.txt +++ /dev/null @@ -1,19 +0,0 @@ -### What it does -Checks for the result of a `&self`-taking `as_ptr` being cast to a mutable pointer - -### Why is this bad? -Since `as_ptr` takes a `&self`, the pointer won't have write permissions unless interior -mutability is used, making it unlikely that having it as a mutable pointer is correct. - -### Example -``` -let string = String::with_capacity(1); -let ptr = string.as_ptr() as *mut u8; -unsafe { ptr.write(4) }; // UNDEFINED BEHAVIOUR -``` -Use instead: -``` -let mut string = String::with_capacity(1); -let ptr = string.as_mut_ptr(); -unsafe { ptr.write(4) }; -``` \ No newline at end of file |